Trail mix is a heterogeneous mixture. In scientific terms, a heterogeneous mixture is one where the components are not uniformly distributed and can be easily distinguished from one another. Trail mix typically contains a variety of ingredients such as nuts, dried fruits, seeds, and sometimes chocolate or granola. Each of these components retains its individual properties and can be seen and separated from the mixture.
Unlike a homogeneous mixture, where the composition is uniform throughout, trail mix has a non-uniform composition. This means that if you take a handful of trail mix, the proportion of nuts to fruits to seeds might vary from one handful to another. This variability is a key characteristic of heterogeneous mixtures.
In summary, trail mix is a heterogeneous mixture because it consists of visibly different substances that are not evenly distributed throughout the mixture.